Visit confidence and legacy points

This guide covers Dawarich 1.20.0.

Full-history redetection preserves confirmed visits and backfills missing confidence from their own coordinate-bearing points. Points whose lonlat is NULL do not contribute to point count, accuracy, center, or radius. This applies to direct Visits::Detection::VisitRescore.call, explicitly preloaded point sets, legacy backfill, and batch-edge stitching.

When no coordinate-bearing points remain, rescoring leaves the visit and its existing confidence/breakdown unchanged. A legacy visit with no score stays unscored and retains its existing visibility and status; no score is invented from an Area or Place alone. Valid observations retain the existing confidence rules.

Legacy backfill reads slim point rows once per 200 visits and preloads Area/Place associations. Stitch centers also use batched projections. These filters do not repair or delete old point records, change Point#lat/#lon, or suppress unrelated job errors. No migration or automatic replay of previously failed jobs is included. An operator can retry a failed visit-redetection job after upgrading, or the user can request full-history redetection again.